These new sanding sheets are manufactured to exacting professional standards making them ideal for all your sanding needs. They are waterproof so the grit will not wash off during wet-sanding. These sheets are flexible enough to mold around our sanding sticks (UMM21 to UMM27) and can be easily cut to whatever size or shape you need. They come in several grits from course to very fine so you can use them for rough sanding as well as polishing. We know these will be a useful addition to your modeling tool resources.